To find the marginal relative frequency of people who play winter sports, we will use the total number of people who play winter sports relative to the overall total number of people surveyed.
From the table, the total number of people who play winter sports is 157. The overall total number of people surveyed is 287.
Now we can calculate the marginal relative frequency as follows:
\[ \text{Marginal Relative Frequency} = \left( \frac{\text{Total who play winter sports}}{\text{Total surveyed}} \right) \times 100 \]
\[ \text{Marginal Relative Frequency} = \left( \frac{157}{287} \right) \times 100 \approx 54.74% \]
Rounding to the nearest whole percentage gives us:
\[ \text{Marginal Relative Frequency} \approx 55% \]
Thus, the marginal relative frequency of people who play winter sports is 55 percent.